2Performance Tests
54 E4416A/E4417A Power Meters Service Guide
• Adjust the front panel Coarse Zero control to obtain a zero meter
indication.
11 Zero the Agilent 432A test power meter:
• Fine zero the Agilent 432A on the most sensitive range.
• Set the RANGE switch to 1 mW.
12 Set the DVM to measure microvolts.
13 Connect the positive and negative input leads to the Vcomp and VRF
connectors respectively, on the rear panel of the Agilent 432A.
14 Observe the reading on the DVM:
If less than 400 μV, go to step 15. If 400 μV or more, press and hold the
Agilent 432A Fine Zero switch and adjust the Coarse Zero control so that
the DVM indicates 200 μV or less. Release the Fine Zero switch and go to
step 15.
15 Round off the DVM value to two decimal places. Record this value as V
o
:
• V
o
___________
16 Turn the power reference on:
Press
,
17 Round off the DVM reading to two decimal places. Record this value as V1:
• V
1
___________
18 Turn the power reference off:
Press
,
19 Disconnect the DVM negative input lead from the VRF connector on the
Agilent 432A. Reconnect it to the Agilent 432A chassis ground.
20 Observe the reading on the DVM. Record this value as Vcomp
• V
comp
___________
21 Calculate the power measured from the power reference oscillator using
equation 2- 9:
Equation 2-9:
P
1
2 V
comp
V
1
V
0
–()V
0
2
V
1
2
–+⋅
4 R
1
⋅
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